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OpenStudy (anonymous):
In the system shown below, what is the sum of the x-coordinates of all solutions? 7x^2+3y^2=187 3y^2-7x=47
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OpenStudy (raden):
maybe this is a shortcut. subtract the 1st equation with 2nd equation, what do you get ?
OpenStudy (anonymous):
I got 7x^2+6y^2-7x-140=0. Is that correct?
OpenStudy (anonymous):
I have ((-5,2)(-5,-2)(4,5)(4,-5) would the sum of all x-coordinates be -2?
OpenStudy (raden):
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